Average annual temperature is 23.6 °C
Absolute maximum temperature: 33.5 °C
Absolute minimum temperature: 15.2 °C
Number of sunny days: 44 days
Number of rainy days: 321 days
Look at detailed online map of Gannoruwa West
* Weather data for Gannoruwa West Sri Lanka is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 28.0 | 29.2 | 32.3 | 33.5 | 30.3 | 28.9 | 28.5 | 31.2 | 28.6 | 28.6 | 28.4 | 28.5 |
| Average daytime temperature (°C) | 26.6 | 27.5 | 29.6 | 30.7 | 28.2 | 27.6 | 26.9 | 29.4 | 26.9 | 27.0 | 27.3 | 27.1 |
| Average temperature (°C) | 22.0 | 22.9 | 24.2 | 24.7 | 24.3 | 24.4 | 23.8 | 24.7 | 23.2 | 22.9 | 22.8 | 23.3 |
| Average night temperature (°C) | 18.3 | 18.9 | 19.9 | 20.2 | 21.2 | 21.8 | 21.2 | 21.0 | 20.5 | 19.9 | 20.1 | 20.6 |
| Absolute minimum temperature (°C) | 15.2 | 16.5 | 18.6 | 18.9 | 19.7 | 20.1 | 19.5 | 19.4 | 18.0 | 18.1 | 18.9 | 19.4 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 |
| Daylight mean duration (h) | 11.8 | 11.9 | 12.1 | 12.3 | 12.5 | 12.5 | 12.5 | 12.4 | 12.2 | 12.0 | 11.8 | 11.7 |
| Daylight minimum duration (h) | 11.0 | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 |
| Sunshine mean duration (h) | 9.5 | 9.6 | 10.1 | 9.9 | 9.2 | 9.9 | 9.3 | 10.8 | 8.2 | 7.4 | 7.2 | 8.1 |
| Precipitation (mm) | 71 | 85 | 75 | 152 | 148 | 98 | 155 | 57 | 165 | 450 | 538 | 280 |
| Sunny days | 14 | 12 | 3 | 4 | 1 | 0 | 1 | 4 | 0 | 1 | 0 | 4 |
| Rainy days | 17 | 16 | 28 | 26 | 30 | 30 | 30 | 27 | 30 | 30 | 30 | 27 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Gannoruwa West is at